Here's a clever idea for a refrigerator design. It takes the idea of a separate freezer and cooler section even further. Break the appliance up into even smaller units. Each unit takes less energy to cool and loses less cold air when you open the door.
We bought one of those fridges with the freezer on the bottom several years ago and love it. It made so much sense to put all the items on the top in the compartment that was opened the most often and the freezer on the bottom that is opened less often.
[Image captured from http://www.inhabitat.com/2009/07/22/flatshare-fridge-stackable-refrigerator-a-la-legos/]